Professional PZ2 impact torsion screwdriver bits The DeWalt DT70556T-QZ Impact torsion bits specially designed with hardened core for extra toughness and long lasting life. The optimised torsion zone allows the bit to flex rather than break, even when used in extreme demanding applications. These bits are suitable for applications in wood, plastic, drywall and metal. The bits are supplied in tough, handy sized flip top box. Features and Benefits: Extra hard bits. High quality steel. In Tic Tac dispenser. Suitable for impact drivers. Heat-treated for increased durability